Direct Answer
Comfort Systems USA reports revenue across 2 product and service lines in its fiscal 2025 Form 10-K. Mechanical is the largest, with $6.7 billion of revenue (73% of the total), followed by Electrical at $2.4 billion (27%).
How Does Comfort Systems USA Make Money?
Mechanical supplies 73% of revenue, so Comfort Systems USA's results move mostly with that one business; the others matter more for diversification than for the headline number. Between fiscal 2024 and 2025, Electrical grew fastest (+61.9%) and Mechanical slowest (+20.7%), so the revenue mix tilts toward Electrical while that gap lasts.
| Product or service | FY2025 revenue | FY2024 revenue | Share of revenue | Change |
|---|---|---|---|---|
| Mechanical | $6.7 billion | $5.5 billion | 73.3% | 20.7% |
| Electrical | $2.4 billion | $1.5 billion | 26.7% | 61.9% |
What the Segment Figures Do Not Show
The rows above add up to 100% of Comfort Systems USA's reported revenue for fiscal 2025; the difference is intersegment eliminations, corporate revenue or items the company reports outside its segments. Segment definitions are management's choice and change when a company reorganizes, in which case it restates prior years in the next filing, so a multi-year comparison should use the figures from a single filing. Revenue shows where sales come from, not where profit or cash is earned: a small segment can carry most of the margin.
Where These Numbers Come From
Every figure on this page is a value Comfort Systems USA reported in the segment note and revenue disclosures of its Form 10-K filed February 19, 2026 (accession 0001104659-26-017530), read from the SEC's Financial Statement Data Sets. The prior-year column is the comparative figure from that same filing, so it reflects any restatement for a change in segments. Category names are the company's own XBRL labels, lightly reformatted for reading.
Rows that only total other rows (for example a "Products" line beside the individual products) are left out so nothing is counted twice. This page is educational and describes reported history for fiscal 2025; it is not a forecast or a recommendation.
Frequently Asked Questions
What are Comfort Systems USA's main products and services?
In its fiscal 2025 Form 10-K, Comfort Systems USA reports revenue for Mechanical and Electrical.
Which part of Comfort Systems USA brings in the most revenue?
Mechanical, with $6.7 billion of revenue in fiscal 2025, or 73% of the total.
Where does Comfort Systems USA report its segment results?
In the segment note to the financial statements in its Form 10-K, most recently filed February 19, 2026, alongside management's discussion of each segment's results.